Apparatus for forming concrete floors



Ma ch 28,1933. H. w. Rob l '1 .9" 2,s9s, APPARATUS F9 FORMING coNRETE FrooRg I Filed March 15; 1930 2 Shets-Shaet 1' IN VENTOR v 721's .A TTORNE V March 28, 1933. H. 'w'. 905 4 1,902,898

I I API ARATUSFQR FORMING CONCRETE FLOORS Filed March 13, 1930' 2 SheetS- -S'heet 2 Ft 11v VENTOR 41E; M u, l l] 299 no .g

H9 TyWROQS' Patented Mar. 28, 1933 UNITED STATES HENRY W. ROOS, OF CINCINNATI, OHIO APPARATUS FOR FORMING CONCRETE FLOORS Application fi1ed March 13, 1930. Serial No. 435,466.

This invention relates to improvements in apparatus for forming molds for concrete floors, and especially to that type of floor commonly known in the art as joist and tileconstruction. In this construction, forms are assembled to form continuous'substantially parallel domes extending in one direction, with depressions between them for the formation of oists. These forms have been made of substantially uniform size and shape, with the result that it generally happens in assembling a floor that a space less than the length of the dome remains, which it is customary to fill by means of dome-shaped forms overlapping the ends of the adjacent dome forms in the assembled floor. The narrow space sometimes appears at the ends of the domes, and often results in the loss of much time in providing means for filling in or bridging the space.

The principal object of this invention is to provide simple and inexpensive means for filling this narrow space, and which can be quickly assembled in the floor mold.

Another object of the invention is to provide a dome-shaped form for a floor mold constructed of two parts relatively adjustable to form a short dome to fill in the narrow space.

A further object of the invention is to provide an adjustable dome-shaped form for a floor mold adapted to be mounted on an adjustable frame and adjustable as a unit with the frame to provide a short form adapted to be supported on temporary supports in the narrow space.

Still another object of the invention is to provide a frame for dome-shaped forms, which is longitudinally adjustable to the width of a narrow space in a floor mold.

A still further object of the invention is' to provide a dome-shaped form constructed of two parts movable relatively to each other along the longitudinal dimension of the dome for adjustment, and means for securing the parts in adjusted position.

To these and other ends, the invention consists in the construction and arrangement of parts that will appear from the following description when read in conjunction with the accompanying drawings, the novel features being pointed out in the claims following the specification.

In the drawings:

Fig. 1 is a fragmentary plan view of a fioor mold assembled of dome-shaped forms. illustrating one application of this inven ion;

Fig; 2 is a vertical transverse section through an adjustable frame for a floor mold and showing an adjustable dome form mounted therein, the section being taken sub-- stantially on line 22 of Fig. 4:;

Fig. 3 is a vertical longitudinal section through the adjustable dome form and its frame, taken substantially on line 3-3 of Fig. 2-; r

Fig. 4 is an enlarged inverted plan view of an adjustable frame showing an adjustable. dome form mounted thereon, parts being broken away to conserve space, and v Fig. 5 is a section taken substantially on line 55 of Fig. 4,.and looking in the direction of the arrow at-saidline.

Referringspecifically to the drawings, in, which like reference numerals refer to the same parts in all figures, 1 represents a unit form comprising a frame 2 having its corners cut away to fit around the tops 3 of temporary supports or shores on which the forms are mounted. Each of the frames is substantially rectangular in form anddivided into two parts by means of a bar or bridge arranged between its ends, forming two parallel openings in each of which a domea} shaped form is mounted. A pluralityof the.

frames 1 of substantially the same size and shape, and each having a pair of domes of uniform size and shape mounted thereon, are assembled on temporary supports in rows extending both transversely and longitudinally of the floor to'be formed to form 'a mold therefor. The dome-shaped forms are flush with the ends of the frames sothat the endsv of the dome forms on adjacent frames con- 9 tact closely with each other andform in effect continuous parallel domes in the mold having depressions between them for the formation of joists. l

. When forms of uniform size and shape are of standard size;

5' such as welding.

' row space and are adapted to be assembled therein on the temporary supports.

Each of the frames 5 comprises a pair of end members 7", to the ends of which corner brackets 8 are secured by any suitable means, The brackets are angular in shape to flt around the tops of the shores which engage brackets on the shores to support the frames. The end members 7 are construct ed of angular material having an inwardly projecting part 9 and a downwardly projecting flange 10 at the end of the frame. The brackets 8 are secured to the innerwalls of the flanges 10 and are offset outwardly, flush with the outer walls thereof,

25 and extend outwardly toward the sides of the frame to a point flush with the end of the flange 9 which projects beyond the end of the flange 10. The bracket is then bent inward-' .ly in a direction parallel with the sides of the frame and then laterally toward the side of the frame at substantially right angles a distance substantially equal to the width of V the side member of the frame and then at 5 right angles in the direction in which said side member extends.

. Side rails generally referred to by the numeral 12 are arranged between the end members 7, and secured at their ends preferably by welding to the brackets 8. Arranged and extending between the end members 7 of the frame is a cross-bar or bridge.

. side bars 12 and midway between them, thus dividing the frame into two parts of substan- 5 'tially the same sizeand shape. Upon reference to Fig. 4 it will be notedthat the bridge 13 is of substantially twice the width of the "side member 12. r

The side members 1.2 and the bridge 13 are each constructed in two parts movable toward and from each other for purposes of adjustment'to vary the length of the frame. To this end, the side members of the part 15 r i of the frame each comprise an angle iron having a horizontal portion 16 and a downwardly projecting flange 17 at its inner side.

These side members are of a length substantially equal to one half the length of the frame when fully extended. Secured to the lower wall of the horizontal portion 16, preferably byrwelding, are a plurality of brackets 18 spaced from each other and having downwardly projecting flanges adjacent the outer side of the side member of the frame. Only two of thesebrackets are shown 7 The bridge 13 is arranged substantially parallel to the in the drawings; however, it will be underas shown, is a longitudinally arranged rod or bar 24 which projects inwardly beyond the inner ends of the flanges 21, and at its inner end is provided with a plurality of slots or openings 24 adapted to register with openings in the downwardly projecting flanges of the brackets 18, whereby they may be secured thereto by means of bolts arranged in the openings. I

Secured to the outer side of the flange 22, by means of bolts or other suitable means,,is ,a second rod or bar 25 parallel with and of substantially the same length as the bar 24. The bar 25 is also provided with slots or openings adjacent its inner end which correspond with the openings in the bar 24. The inner end of the bar 25 overlaps the outer face of the downwardly projecting flange 17, which is provided with openings with which the openings in the bar 25 are adapted to register for the reception of'bolts, whereby the bar may be secured to-the flange.

The cross-bar or bridge is also constructed of two parts movable relatively to each other for purposes of adjustment. Secured to the end member ofthe part 15 are a pair of angle irons 27 spaced from each other and substantially parallel, see Fig. 2. Each of these irons was a downwardly projecting flangej28 at its outer edge and an inwardly projecting flange 29 at its upper edge. A cover in the form of a sheet metal plate 30 may be supported on the flanges 29 to bridge the space betweenthem. A similar pair of angle irons 31 are secured to the end member of the part 20, and are of a length. substantially equal to the length of the corresponding angle irons in its sides. The space between the angle irons 31 isalso bridged by means of a plate 32 of sheet material.

A rod or bar 33 is secured to the inner faces 7 of each of the'flanges 28 by means of bolts, as shown, or other suitable means. The rods 33 are arranged substantially parallel with each other and with the bars 24; and 25 in the sides of the frame, and of substantially the 2 I 18 to the rods 24, 25 and 33, the twogparts 15 It will be and of the frame are free to be moved or adjusted toward or from each other and the bolts may then be reinserted in the newly alined openings for securing or retaining the parts in the adjusted position.

Adjustable dome-shaped forms are provided which are adapted to be mounted in the frame, and for this purpose the lower,

vertical portions of its sides are provided with openings adapted to register with openings in the flanges 17 and 28 and also with the openings in the bars and 33, so that it may be secured thereto by the same bolts which secure the parts of the frame in adjusted position. The part 36 is mounted on the other end of the frame and is provided with openings adapted to register with the openings in the bars 33 and 25 so that it may also be secured to the frame by the same bolts which secure said bars to the bridge and side members. The part 35 of the dome form overlaps the part 36 and may be constructed of a slightly larger size to allow for the thickness of the material.

The part 36 of the dome is secured in the part 20 of the frame as previously described,

and the part 35 is-then arranged over the part 36 of the dome and on the other end of the frame, with its inner end overlapping the inner end of the part 36 a distance depending on the adjustment of the frame or the width of the narrow space. The bolts for securing the dome to the part 15 of the frame, and the part of the frame to the rods 33 and 25 are then inserted for securing the parts together.

At the ends of the frame, the sides of the dome forms are cut out to provide a clearance for the ends of the frame so that the ends of the dome forms may project thereover to be flush with the end of the frame. By this arrangement, the ends of the domes fit closely against the ends of the domes on the adjacent frames to continue the same as a unit over the narrow space. By this construction, the domes are adjusted with the parts of the frame to fit the narrow space, and secured in the adjusted po sition by securing the rods 2st and 25 to the part 15. I

Reinforcing strips 40 in the form of angles may be secured to the inner walls of the dome at suitable intervals to prevent sagging or bending of the material under a heavy load of concrete, One such reinforcing strip is provided in the inner end of the part 36, but'they are omitted from the inner end of the part 35' for such a distance as it may overlap the. inner end of the part 36 in its various positions of adjustment.

Upon reference to the drawings, it will be noted that open spaces are formed in the sides between the inner ends of the parts 16 and 21 and also between the corresponding parts of the bridge. These openings are readily filled by means of strips of sheet material of a width substantially equal to the width of the bridge member or twice the width of the side members of the frame,

and of a length sufiicient to overlie the inner ends of the side and bridge members. I

In Fig. 1, the floor is shown framing'into a beam at the left. The beam forms are suspended from T-shaped forms 46, cut out at their ends to fit around the tops of the shores 3 on which they are supported. a The ends ofthedomes adjacent the beam are open, and means are provided for closing the open ends of the domes along the sides of the beam. Said means comprises an end plate 47 shaped to conform substantially to the cross-section or end of. the dome and adapted to engage the end of the dome or a reinforcing strip 40 therein. At its lower edge, the end plate has an inwardly projecting flange 48 adapted to engagethe top of the end of the frame to which it may be secured by bolts or other suitable means.

Although the invention has been described A with reference to a single embodiment thereof, it will be understood that this application is intended to cover such changes or modifications thereof as may come within the spirit of the invention or scope of the following claims.

I claim:

1. A unit form for concrete floor molds comprising a substantially rectangular frame having a pair of openings therein and comprising two parts adjustable relatively to each other, a bridge extending longitudinally of said frame and separating said openings, a plurality of rods projecting inwardly from one of said parts each having a plurality of openings therein, a plurality of flanges on the sides and bridge of the other of said parts overlapping said rods and each provided with a plurality of openings arranged to register with corresponding openings in said rods, means detachably arranged in said openings for securing the flanges to the rodsand the parts of the frame to each other, a dome form mounted in each of said openings in the frame, and means on the frame engageable directly with shores on w hich it is mounted.

2. A unit form for concretefloor molds comprising a substantially rectangular frame having a pair of openings therein and-cut away at its corners to engage the sides-of shore tops in the plane of which the frame is 7 adapted to be mounted, said frame comprising side and end members and a bridge connectingsaid end members and separating the.

openings of said pair, each of said sidemembers and bridge comprising two parts, a

downwardly projecting flangevon the outer side of each partof said side members, a plurality of brackets on the side members of one of said parts having downwardly proj'ecting flanges spaced inwardly from said first mentioned flanges, bars secured to and between the flanges on said brackets and side member and projecting therefrom to overlap and engage the flanges on the side members of the other part of the frame, and means for securing saidbars to said flanges on the other part for retaining the parts of the frame in adjusted position. r

In witness whereof, I have hereunto signed my name.

' HENRY W. ROOS. 

